Pump.



K PATBNTBD IUNE'G; 1905.

F. E, TN BYGK.'

PUMP. APPLICATION FILED JULY 24, 1903.

www I UNITED STATES Patented June 6, 1905.

PATENT OFFICE.

- PUMP.

SPECIFICATION forming part of Letters Patent No. 791,733, dated June 6,1905.

Application filed .Tuly 24., 1903. Serial No. 166,853. l

A ing, taken in connection with the accompanytreme compressed or normalpositions. l 3, 4., 5, and 6 are sectional views taken on lines' 3 3 andl 4., Fig. l, 5 5, Fig. 3, and 6 6, Fig. 4.. f'

ing drawings, is a full, clear, and exact description. Y

This invention relates to improvements in pumps, and refers moreparticularly to compound air-compression pumps adapted for iniatingpneumatic tires and for other purposes y `1n-wh1ch a-high degree ofcompression is required.

My object is to-produce'a simple, compact,

'and durable air-pump which normally occupies aminimum space and iscapable of producing a high degree of compression in a short space oftime and with asmall degree of lpower.

Other objects will be brought out in the following description.

In the drawings, Figure 1 is a vertical sectional view, partly inelevation, of my improved pump shoWn in its eXtreme distended position.

Fig. 2 is an enlarged vertical section of the same, ybut at right anglesto that vseen in Fig. l, show-i-ng the parts in their eX- Figs.

Similar reference characters indicate corresponding parts in all theviews.

This invention comprises, essentially, three concentric tubularcylinders 1, 2, and 3, whichA are constructed and arranged to carry outthe object previously stated, and are mounted in an upright position andadapted for inflating pneumatic tires. It will be evident, however, fromthe subsequent description that the'essential features of the inventionmay be utilized for other purposes and operated by other 'than handpower.

The outer or larger cylinder is threaded eX- teriorly at both ends toreceive lower and upper screw-caps 4 and 5, and a tapering bushing orplug 6 is inserted in its' lower end, so that when the lower-cap isscrewedv in place the plug or bushing operates to slightly eX- pand saidlower end .of the cylinder, and thus;

brings-the threads into closer and morepositive locking engagement toprevent buckling or spring of the metal and to render the joint moreperfectly air-tight and better nadapted to resist the strains to whichit is subjected. A suitable foot-piece or stirru-p 7 is secured to thelower end of the cylinder 1 and in this instance forms -a part of thelower cap t to support the pump in an upright position, said lower capbeing imperforate and serving to close the lower end of the cylinder. r

Both of the caps are removable to permit the parts of the pump to bemore readily assembled or dissembled; but the upper cap is provided withone or more air-intake and vent openings 8 and with a central hollowboss or guide 9, which latter receives-and partially guides the cylinder2 in its reciprocal movement, as presently described. This cylinder 2consists of a metal tube which is arranged centrally within the outer.cylinder 1, and tightly fitted in its lower end is a valve-case orhollow bushing 9', in which is movable a' to permit the piston tocompress slightly on the upstroke, so that the air may readily pass fromthe upper to the lower part of the cylinder around the piston. Thecoupling or 'bushing 11 is formed with a lengthwiseairor similar packingon its lower face and is arranged to move endwise in the bushing 9 `Withits corners in sliding engagement with the inner walls of saidbushing,-so that the air may readily pass upwardly along the sides ofthe valve when it is unseated by the downward stroke of the piston. Theupper end of the bushing 9 has a restricted central opening 16, throughwhich the air may pass into y the interior of the cylinder 2 frombeneath the piston 12, and it is now evident that when the piston 12 isdepressed by the downward movement of the cylinder 2 the air is expelledfrom the lower end of the cylinder through the passages 15 and 16 intothe cylinder 2. The cylinder 3 is movable endwise in the cylinder 2 andalso consists of a metal tube of less diameter than the inner diameterof the cylinder 2, and its lower end is provided with a piston 17 and avalve 18, which are similar to but much smaller than the like parts ofthe cylinder 2 and operate in substantially the same mannerwthat is, thepiston 17 is connected to the cylinder 3 by bushing or couplings 19 and20, similar to the bushings 9 and 11, and is held in place by washers 21and a lock-nut 22, similar to the like parts 13 and 14 of the piston 12.

rlhe upper end of the cylinder 2 is hollow to form a guide Jfor the tube3 and is provided with a suitable handle 23, by which it may be movedendwise in the cylinder 1 to operate the piston 12. The upper end of theinner tube or cylinder 3 extends through and above the upper end of thecylinder 2 and handle 23 and is secured to the upper end of a slidingframe or yoke 24, to which a fiexible tube 25 is secured andcommunicates with the tube 3. rlhis sliding frame or yoke 24 consists oflower and upper heads 26 and 27 and a pair of tie-rods 23, uniting saidheads, the lower head being mounted with a sliding fit upon the outercylinder 1 and usually consists of an open metal ring having aperturedlugs to which the lower ends of the tie-rods 28 are secured. The lowerand upper caps 4 and 5 serve as stops Jfor engaging the head 26 andlimiting the reciprocal movement of the frame 24.

In the operation of my improved pump, assuming that the tube 25 isconnected to the tire to be infiated and that the parts are in theirnormal position, (seen in Fig. 2,) the operator first raises thecylinder 2 to the limit of its upward movement by means of' the handle23, which operation also raises the frame 24 and inner cylinder 3 andpermits the air to pass around the piston 12 into the base of thecylinder 1. The cylinder 2 and its piston are then forced downwardly bythe handle 23; but the inner cylinder 3 and frame 24 remain, held byfriction, in their extreme upper position, so that the air in the baseof the cylinder 1 is expelled into the cylinders 2 and 3 and passesunder light pressure into the tube 25 and tire, if the latter isdefiated, it being evident that the valves of both cylinders 2 and 3open automatically on such downstroke of the piston 12. It is nowapparent that the air is partially compressed in the cylinders 2 and 3and that a considerable space intervenes between the pistons 12 and 17,so that when the piston 12 is returned on the upstroke the valve 10closes automatically by air-pressure from above, and the air in thecylinders 2 and 3 is thus still further compressed in the tire.

lt will be observed that the cylinder 2 and piston 17 are ofconsiderably less cross-sectional area than the cylinder 1 and piston 12and that as the piston 12 is moved downwardly away from the piston 17and the compression-space in the cylinder 1 gradually reduced the spacein the cylinder 2 between the pistons is gradually increased, so thatthe downward stroke of the piston 12 is effected with comparative easeand little power; but at the same time the air is compressed in thecylinder 2and is held therein by the valve 10, while the valve 18prevents back pressure from the tire to the cylinder 2. On the otherhand, the smallness of the dialneters of the cylinder 2 and piston 17permits the piston 12 to be drawn upwardly toward the piston 17 withcomparative ease and at the same time rapidly produces a high degree ofcompression in the tire by reason of the previous partial compression ofair in the cylinder 2. It is thus seen that the work of compression isdistributed between the two pistons 12 and 17, which reduces theliability of overheating of the pump.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

1. An air-pump comprising an outer cylinder, an inner tube, and a yokeconnected thereto and having sliding connection with the outer cylinderand provided with a piston and a valved passage, and an additionalcylinder movable in the outer cylinder and receiving the piston of theinner cylinder, said additional cylinder havinga piston fitting in theouter cylinder.

2. An air-pump comprising an outer cylinder, an inner cylinder movablein the outer cylinder and having a valved passage in its lower end, apiston on the inner cylinder and fitting in the outer cylinder, and atube in the inner cylinder having a valved passage in its lower end andan outlet-passage in its upper end.

3. An air-pump comprising an outer cylinder, an inner cylinder movablein the outer cylinder and having a valved passage in its lower end, apiston on the inner cylinder and fitting in the outer cylinder, and atube in the inner cylinder having a valved passage in its lower end andan outlet-passage in its upper end, and a flexible tube secured to theupper end of the last-named tube.

4. An air-pump comprising an outer cylinder, an inner cylinder movablein the outer cylinder, and having a valved passage in its lower end, apiston on the inner cylinder and fitting in the outer cylinder, and atube in the inner cylinder having a valved passage in its lower end andan outlet-passage in its upper IOO IOS

IIO

end, and a yoke attached to said tube and having sliding connection withthe outer cylinder.

. 5. An air-pump comprising an outer cylinder having an imperoratebottom and an airinlet at its top, a second cylinder movable in therst-named cylinder and provided with a flexible cup-piston contractingon the upstroke to allow the air to pass below, and expanding on thedownstroke against the sides of the tirst cylinder to force air upwardlyinto the second cylinder, a check-Valve in the lower end of the secondcylinder and a tube in the second cylinder having a eXible cup-pistonand a valved passage for the purpose described.

6.' A pump comprising a main cylinder having one end closed and itsother end provided with 'a guide-opening, a second cylinder movablelengthwise in the main cylinder and in said guide-opening, apiston and avalve on one end of the second cylinder anda handle on its other end,athird cylinder movable lengthwise in the second cylinder, a piston anda valve on the inner end of the third cylinder, and a sliding headmovable lengthwise of the main cylinder and connected` to the louter endofthe third cylinder.

7. A pumpcomprising a maincylinder having one end closed and its otherend provided with a guide-opening, a second cylinder movend of theIsecond cylinder, a third cylindermovable lengthwise in the secondcylinder, a piston and a valve on the inner end of the thirdcylinder anda head in sliding enga-gement with the main cylinder. and connected withthe o uter end of the third cylinder.

8. A pumpy comprising a main cylinder having one endclosed and its otherend provided with a guide-opening, a secondcylinder movable lengthwisein the main cylinder and in said guide-opening, athird cylinder movableinthe second cylinder, the latter two cylinders having passages throughtheir lower ends, valves in said. passages, pistons onthe second andthird cylinders in proximity to the valves,

and a head in sliding engagement with the main cylinder and operativelyconnected to the outer end of the third cylinder to hold it in itsadjusted position.

In witness whereof l have hereunto set my hand this 13th day of July,1903. y

FRANK E. TEN EYCK.

Witnesses:

H. E. CHASE, e HOWARD P. DENIsoN.

